package cc.chengheng.security.filter;

import cc.chengheng.security.entity.SecurityUser;
import cc.chengheng.security.entity.User;
import cc.chengheng.security.security.TokenManager;
import cc.chengheng.utils.utils.R;
import cc.chengheng.utils.utils.ResponseUtil;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.security.authentication.AuthenticationManager;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.AuthenticationException;
import org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter;
import org.springframework.security.web.util.matcher.AntPathRequestMatcher;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.ArrayList;

public class TokenLoginFilter extends UsernamePasswordAuthenticationFilter {

    private TokenManager tokenManager;
    private RedisTemplate redisTemplate;
    private AuthenticationManager authenticationManager;

    public TokenLoginFilter(TokenManager tokenManager, RedisTemplate redisTemplate, AuthenticationManager authenticationManager) {
        this.tokenManager = tokenManager;
        this.redisTemplate = redisTemplate;
        this.authenticationManager = authenticationManager;
        super.setPostOnly(false);
        super.setRequiresAuthenticationRequestMatcher(new AntPathRequestMatcher("/admin/acl/login", "POST"));
    }

    /**
     * 获取表单提交用户名和密码
     */
    @Override
    public Authentication attemptAuthentication(HttpServletRequest request, HttpServletResponse response) throws AuthenticationException {
        ObjectMapper objectMapper = new ObjectMapper();
        try {
            User user = objectMapper.readValue(request.getInputStream(), User.class);
            return authenticationManager.authenticate(
                    new UsernamePasswordAuthenticationToken(
                            user.getUsername(),
                            user.getPassword(),
                            new ArrayList<>()
                    )
            );
        } catch (IOException e) {
            e.printStackTrace();
            throw new RuntimeException();
        }
    }

    /**
     * 认证成功调用的方法
     */
    @Override
    protected void successfulAuthentication(HttpServletRequest request, HttpServletResponse response, FilterChain chain, Authentication authResult) throws IOException, ServletException {

        // 认证成功，得到认证成功之后的用户信息
        SecurityUser user = (SecurityUser) authResult.getPrincipal(); // 就是调用了UserDetailsService的是实现类返回的UserDetails对象

        // 根据用户名生成token
        String token = tokenManager.createToken(user.getCurrentUserInfo().getUsername());

        // 把用户名称和用户权限列表放到redis
        redisTemplate.opsForValue().set(user.getCurrentUserInfo().getUsername(), user.getPermissionValueList());

        // 返回token
        ResponseUtil.out(response, R.ok().data("token", token));
    }

    /**
     * 认证失败调用的方法
     */
    @Override
    protected void unsuccessfulAuthentication(HttpServletRequest request, HttpServletResponse response, AuthenticationException failed) throws IOException, ServletException {
        ResponseUtil.out(response, R.error());
    }
}
